Apparatus for transmitting synchronous movements by rotating magnetic fields.



R. FEDERICO-& L. SEGALIN. APPARATUS FOR TRANSMITTING SYNCI'IRONOUS MOVEMENTS BY ROTATING MAGNETIC FIELDS.

APPLICATION FILED MAY 25. 1913.

Patented May 9,1916.

2 SHEETSSHEET I R FEDERICO & L. SEGALIN. APPARATUS FOR TRANSMITTING SYNCHRONOUS MOVEMENTS BY ROTATING MAGNETIC FIELDS.

' APPLICATION FILED MAY 26, I913.

1,1824 57, I Patented May 9, 1916.

2 SHEETSSHEET 2- Fig.7

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Ndifi Ma;

UNITED STATES PATENT OFFICE.

ROSARIO FEDERICO AND LEANDRO SEGALIN, OF TURIN, ITALY.

vAPIPARA'IUS FOR TRANSMITTING SYNCI-IRONOUS MOVEMENTS BY ROTATING MAGNETIC FIELDS.

Specification of Letters Patent.

atentcd May S), 1916.

Application filed May 26, 1913. Serial No. 769,945.

To all whom it may concern:

Be it known that we, RosARro F nmnmo and LEANDRO SEGALIN, subjects of the King of Italy, residing at Turin, Italy, have invented certain new and useful Improvements in Apparatus for Transmitting Synchronous Movements by Rotating Magnetic Fields, of which the following is a specification.

The-present invention relates to an installation for controlling electric clocks by means of a central regulator, by utilizing the magnetic rotating field.

The object of this invention consists in arrangements which permit of obtaining considerable saving in current and simplification in mechanisms.

The annexed drawing shows a construction of the invention in Figure 4, Figs. 1-3

illustrating the known art. Fig. 1 shows a diagram of a transmitter; Fig. 2 shows a modification; Fig. 3 shows schematically a complete installation, and Fig. 4 shows a form of transmitter. Figs. 5 and 6 show arrangements of the interrupted resistance ring; Fig. 7 shows a complete arrangement for the control of electric clocks; Fig. 8 shows another form of said arrangement.

Fig. 1 shows the scheme of the known arrangements in which a circular shaped re- 'sistance r is connected in two diametrically opposite points A and B to a sourceof current P, and two diametrically opposite movable contacts -ac, slide in contact with same, being arranged at the ends of an insulating rod --b connected with the external circuit R.

In Fig. 2 the resistance is divided into 'n.' sections r= 7', r -connected with a corresponding number of'sections of an ordinary collector -0 on which the brushes or, y, press, the latter being connected with rings in communication with the external circuit. When a threephase current is desired, three brushes at 120 are adopted, and the source of current may be constituted by-cells or mechanical generators of continuous or alternating current.

In order to generate a polyphase current, either the collector c may be fixed and the brushes to be caused to turn, or the brushes are fixed and the collector is caused to turn, thecontacts being eflected at A and B by means of two rings insulated from th pivoted in 0 and axis and two springs leaning on the same rings.

An arrangement is shown in Fig. 3 in which the collector is fixed and two diametral brushes S S turn upon it, and the rheophores feeding the current from the source P are connected with these brushes while the threephase current is obtained through three fixed leads at three points C,

' D, E, equally spaced in the resistance -r-.

'With these arrangements there is however the disadvantage that the consumption of current is fairly high, so that it is impossible'to apply the systems to the control of electric clocks. In order to eliminate this disadvantage and reduce the consumption of current to a minimum, according to the invention the arrangement shown in Fig. 4 is adopted in which two batteries of cells or accumulators P P I P each having their own elements connected in series, are

in opposition or differential connection with regard to one another, and each element is connected to a section of the collector -0-. -The brushes S S S which will be connected, either directly or by gearing, with the transmitting axis, for instance with the axis of one hand of the central regulating clock,

collect, because of the successive insertion of the elements P. and P. a polyphase current, which produces a rotating magnetic field in the stator T of the receiver. lVhen however, continuous current is to be used, it is possible to avoid the useless consumption of current in resistances by means of aresistance ring, by adopting the arrangement shown in Fig. 5, in which an elementary resistance ring 1' interrupted at M and N is inserted in the circuit of the source of current P. The said ring is thus divided into four sections AM, MB, BN and NA equal to'each other, each of which sections is subdivided into many equal or unequal sections, calculated in proportion with the" resistance of the external circuit in such a way that the intensity of current in each of the portions passes from the positive maximum to zero, from zero to the negative maximum, from the negative maximum to zero and from zero to the positive maximum again with equal intervals, during a complete revolution of the brushes 8,.

As in practice it is very advantageous that the polyphase current to be collected from three equally spaced points of the circular resistance the arrangement shown in Fig. (3 may be adopted, in which the resistance ring is interrupted at three points M, N, Q, so as to form three independent groups. In this case the brushes are kept fixed and the collector is caused to turn with its resistances, or vice versa.

In any case a polyphase current is collected having an approximate sinusoidal shape without requiring the current of the feeding circuit to traverse. all the resistances -r-. \Vhatever is the type adopted, the receiver is merely constituted by a stator under the inlluence of which a small iron bar or a magnet directly connected or not called synchronous clocks, it will then be possible to connect the brushes S, S S with the minute hand of the central clock, either directly or by means of a gearing, in order to secure a greater uniformity of movement and to connect the small bar-U turning in the receiver stator T, in an analogous way, with the minute hand of another receiving clock, so that the rotation of this handmay follow the movement which takes place in the regulating clock.

The mechanism of the receiving clocks may be simplified by arranging in them two stators T T having rotating magnetic fields of different period, for instance one with a. period of one hour and another with a period of 19, hours, and by mounting the minute hand on the axis U of the rotor belonging to the stator '1 and the hour hand on the axis V of the rotor belonging to the stator T so that all gearing transmission is dispensed with (Fig. 7). The same object, however, may be attained with a single current having for instance a period of one hour by forming the second stator T (the one which must move the hour hand) of a winding divided into various sections, so that. even sending a current having a period of one hour, the magnetic field may turn with a period of 12 hours, that is to say by applying the same method employed to reduce the speed of rotating magnetic field motors (Fig. 8). In any case a single transmitter can control several receivers. either connected in series or in den 'ation.

\Vhat we claim as our invention and desire to secure by United States Letters Patent is In an apparatus for transmitting synchronous movements by utilizing a rotating magnetic field, a transmitter having a section current distributer, a current generating element connected with each section, said elements formingtwo batteries in series connected in opposition with each other, a transmitter axis connected mechanically with the rotary member M the current distributer, said member having brushes contacting with the segments thereof and adapted to be connected electrically with the stator of the receiver.

In testimony whereof we have signed our names to this specification inthe presence of two subscribing witnesses.

ROSARIO FEDERICO.

LEANDRO SEGALIN.

W'itnesses:

CARLO Tommy, C. S. FEYLES. 

